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Kevin Jordan | 6 Mar 19:08

[FormBuilder] How to validate input not in list?

I need to be able to validate that the information the user puts in a field on my form is NOT in a long list that I have in a file.
The reason behind this being I never want the same value used twice.  For example, once a username is used, I don't want to allow someone to request it again.
 
What is the best way to do this?
 
 
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